The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 18-40mm F4.5-6.3 and the Sigma 18-50mm F2.8 DC DN C for their suitability to various photography scenarios:
Size and Weight Comparison The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 18-50mm F2.8 DC DN C is the longer of the two lenses at 75mm. The Panasonic 18-40mm F4.5-6.3 with a length of 41mm, is 34mm shorter. On the other hand, the Panasonic 18-40mm F4.5-6.3 has a larger diameter of 68mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
Below you can find a scaled side-by-side image of Panasonic 18-40mm F4.5-6.3 and Sigma 18-50mm F2.8 DC DN C to get a better idea of how their sizes compare in real life.
Comparison image of the Panasonic 18-40mm F4.5-6.3 and the Sigma 18-50mm F2.8 DC DN C Size and Weight The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Panasonic 18-40mm F4.5-6.3 weighs 155g, which means it is 135g (46%) lighter than the Sigma 18-50mm F2.8 DC DN C which has a weight of 290g.
Filter Threads
The Panasonic 18-40mm F4.5-6.3 has a filter size of 62mm whereas the Sigma 18-50mm F2.8 DC DN C has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Panasonic 18-40mm F4.5-6.3:
And these are the 55mm filters that we recommend for the Sigma 18-50mm F2.8 DC DN C:
Lens Mounts
Both the Panasonic 18-40mm F4.5-6.3 and the Sigma 18-50mm F2.8 DC DN C has the same Leica L lens mount . Some of the latest released cameras that are compatible with the Leica L lenses are Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE .
Sony E and Fujifilm X mounts.
Focal Range
Panasonic 18-40mm F4.5-6.3 has a focal range of 18-40mm and
2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
27 - 60mm .
On the other hand, the Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-75mm when used on a APS-C / DX format camera.
